Process for producing fast tints on wool



I 20 etc.)

Patented Dec. 19, 1933 I PROCESS Fon P BODUCING FAST TINTS N 1W0 Albert Landolt, Basel,- Switzerland, assignor to; the firm of Society of Chemical Industry, in Basle, Basel, Switzerland N0 Drawing. .ApplicaticnApril 19, 1929, Serial No. 356,620, and in Switzerland April 29,

i V Y N 6 Claims.

The present invention relates to a new process for producing fast red'tints on wool. It comprises the new process and the material-that has been dyed according to the new process.

Hitherto it has not been describedhow'with unsulfonated arylides of the 2:3-hydroxynaphthoic acid and unsulfonated diazo-compounds strong dyeings can be produced which are in fact fast to rubbing, light, fulling and potting.

I have found that this result can be attained 31 by treating wool, on the one hand, with the arylide in such grounding baths which contain in the total at least 1 gram of sodium hydroxide per liter of the grounding liquor, and by using,

5 on the other hand, arylides of the 2:3-hydroxy- ,1 naphthoic acid which derive from such aromatic amines which, apart from one or two NI-Iz-group's, contain no other groups capable of coupling (such as OH, N:[CH3]2, NH-aryl,

Particularly useful are those arylides which derive from aniline,-or also from the halogeno-toluidines.

The above mentioned treatment of the wool does not consist in only a very short padding or impregnation, as is usual for cotton, but the treatment must last sufficiently long to allow the greatest part of the arylide to rush on to the wool. It is appropriate to regulate the temperature of the bath during this treatment in v3Q such a manner that the affinity of the arylide As diazo compounds there come into consideration quite generally the,

for the wool is favorable.

non-sulfonated diam-compounds of the benzene series, such for instance as the chloroand 5 bromo-toluidines. The dyeings are character- L ized not only by their excellent properties of fastness but also by their vividness.

If too little caustic alkali is used there are obtained only feebly colored dyeings which are not fast. Good results are obtained for example with 1.3 to 1.5 grams total NaOH in the liter of grounding liquor, or with the alkali concentrations which are usual in dyeing wool with vat-dyestuffs.

As an example of the invention'the'following directions for dyeingmay be given.-

Grounding.-The wool is grounded inthe bath ratio of 1:30for %-h our at 45 C. in thefollowingbathF 2 3-hydroxynaphthoic acid arylide calculated on the weight of the wool 1.5-3 per cent Turkey red oil 5 cc. Caustic soda solution of 30 per cent strength by weight 3.4 cc. Sulfite cellulose waste liquor or glue.l 20 cc. Common salt 20 grams are dissolved in water to produce 1000 cc.

Development The centrifuged or rinsed wool is developed without intermediate treatment in a cold bath containing per liter 0.01-0.02 mol. of diazotized amine. v

The dyeings on wool obtained according to these directions are very full, clear and fast. I

The following table shows some of the tints which can be obtained in accordance with the What I claim is:--

l. A process for producing fast tints on wool by means of unsulfonated diazo-compounds of the benzen series, and unsulfonated arylides of 2:3- hydroxynaphthoic acid deriving from such aromatic amines which, besides one or two NH2 groups, contain no othergroups capable of coupling,.characterized by causing the arylides to rush on to the wool from suchbaths which contain at least 1 gram of sodium hydroxide in the liter, and then developing the arylides with the diazo-compounds. 1 V

2. A process for producing fast tints on wool by means of unsulfonated diazo-compounds of the benzene 'series, and unsulfonated arylides of 2:3- hydroxynaphthoic acid deriving from such aromatic amines which, besides one or two NHz groups, contain no other groups capable of coupling, characterized by causing the arylides to rush on to the wool from such bathswhich contain at least 1 gram of sodium hydroxide -in the liter and containing 1.5 to 3 per cent. of the arylide calculated on the weight of the wool, and then developing the arylides with the diazo-com pounds.

3. A process for producing :fast tints ons'wool by means of unsulfonated diazo-compoundswf the benzene series, and unsulfonated arylides of 2 3-hydroxynaphthoic acid; deriving! from aromatic mononuclear monoamines which, besides one or two NHz groups, contain no 013 16 groups capable of coupling, characterized bycausirigthe arylides to rush on to thewool" from such "baths which contain at least 1 gram of sodium hydroxe ide in the liter, and then developing the arylides with-thediam-compounds. V

4. A processior .producingfast tintson wool by means of unsulfonated ;diazo comDO., I .ds1 of the benzene series, and. unsulfonated -arylides of 2:3-hydroxynaphthoic acid deriving from aro matic mononuclear monoamines whieh, besides one or two NHz groups, contain no other groups capable of coupling, characterized by causing the arylides to rush on to the wool from such baths which contain at least 1 gram of sodium hydroxide in the liter and containing 1.5 to 3 per cent. of the arylide calculated on the weight of the wool, and then developing the arylides with the diazocompounds.

5. A process for producing fast tints on wool by means of unsulfonated diazo-compounds of the benzene series, and unsulfonated arylides ofr2z3- hydroxynaphthoic acid deriving from aromatic mononuclear 'monoamines which, besides one or two groupaicontainno other groups capable of coupling,Icharacterized by causing the arylides to rush on to the wool from such baths the alkalinity of which corresponds to about 1.3 to

, l,.5 :grams of sodium hydroxide in the liter, and containing 1.5 to 3 per cent. of the arylide cal- .culatedwontherweight of the wool, and then de- 've'loping the arylides with the diazo-compounds. 6..Aprocessiorprgducing fast tints on wool by =;means., .of -unsu1fonated diazotized halogenated 1 q toluidines, and unsulfonated arylides of 2:3-hydroxynaphthoic acid deriving from aromatic mononuelean rnonoamines which, besides one or two NI-I2 groupsfcontain no other groups capable of .coupling, characterized by causing the arylides to rushon to the wool from such baths the alkalinity of which, corresponds to about. 1.3. to 1.5 grams of sodium hydroxide inthe literuand con-. taining, 1.5-1:03 per cent; of the-arylide cal ulated on theweightof the-W001, andlthen developin he arylides, with the diazocompq nds.

LANDOLT. 

